Printmasters relief inks are designed for the accomplished printmaker; these vibrant, highly pigmented, intense true process colors allow you to achieve an unlimited color spectrum. *viscosity similar to that of oil-based inks *water-soluble and compatible with all Speedball water-based block printing inks *AP non-toxic. Easy clean up with water. Printmasters inks can be used in combination with Speedball extrender base to create vibrant transparent layers for producing extended color ranges.